--- /dev/null
+/*
+ * BCM63XX CFE image tag parser
+ *
+ * Copyright © 2006-2008 Florian Fainelli <florian@openwrt.org>
+ * Mike Albon <malbon@openwrt.org>
+ * Copyright © 2009-2010 Daniel Dickinson <openwrt@cshore.neomailbox.net>
+ * Copyright © 2011-2013 Jonas Gorski <jonas.gorski@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/crc32.h>
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/sizes.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+
+#include <asm/mach-bcm63xx/bcm63xx_nvram.h>
+#include <asm/mach-bcm63xx/bcm963xx_tag.h>
+#include <asm/mach-bcm63xx/board_bcm963xx.h>
+
+#define BCM63XX_EXTENDED_SIZE 0xBFC00000 /* Extended flash address */
+
+#define BCM63XX_CFE_BLOCK_SIZE SZ_64K /* always at least 64KiB */
+
+#define BCM63XX_CFE_MAGIC_OFFSET 0x4e0
+
+static int bcm63xx_detect_cfe(struct mtd_info *master)
+{
+ char buf[9];
+ int ret;
+ size_t retlen;
+
+ ret = mtd_read(master, BCM963XX_CFE_VERSION_OFFSET, 5, &retlen,
+ (void *)buf);
+ buf[retlen] = 0;
+
+ if (ret)
+ return ret;
+
+ if (strncmp("cfe-v", buf, 5) == 0)
+ return 0;
+
+ /* very old CFE's do not have the cfe-v string, so check for magic */
+ ret = mtd_read(master, BCM63XX_CFE_MAGIC_OFFSET, 8, &retlen,
+ (void *)buf);
+ buf[retlen] = 0;
+
+ return strncmp("CFE1CFE1", buf, 8);
+}
+
+static int bcm63xx_parse_cfe_partitions(struct mtd_info *master,
+ struct mtd_partition **pparts,
+ struct mtd_part_parser_data *data)
+{
+ /* CFE, NVRAM and global Linux are always present */
+ int nrparts = 3, curpart = 0;
+ struct bcm_tag *buf;
+ struct mtd_partition *parts;
+ int ret;
+ size_t retlen;
+ unsigned int rootfsaddr, kerneladdr, spareaddr;
+ unsigned int rootfslen, kernellen, sparelen, totallen;
+ unsigned int cfelen, nvramlen;
+ unsigned int cfe_erasesize;
+ int i;
+ u32 computed_crc;
+ bool rootfs_first = false;
+
+ if (bcm63xx_detect_cfe(master))
+ return -EINVAL;
+
+ cfe_erasesize = max_t(uint32_t, master->erasesize,
+ BCM63XX_CFE_BLOCK_SIZE);
+
+ cfelen = cfe_erasesize;
+ nvramlen = bcm63xx_nvram_get_psi_size() * SZ_1K;
+ nvramlen = roundup(nvramlen, cfe_erasesize);
+
+ /* Allocate memory for buffer */
+ buf = vmalloc(sizeof(struct bcm_tag));
+ if (!buf)
+ return -ENOMEM;
+
+ /* Get the tag */
+ ret = mtd_read(master, cfelen, sizeof(struct bcm_tag), &retlen,
+ (void *)buf);
+
+ if (retlen != sizeof(struct bcm_tag)) {
+ vfree(buf);
+ return -EIO;
+ }
+
+ computed_crc = crc32_le(IMAGETAG_CRC_START, (u8 *)buf,
+ offsetof(struct bcm_tag, header_crc));
+ if (computed_crc == buf->header_crc) {
+ char *boardid = &(buf->board_id[0]);
+ char *tagversion = &(buf->tag_version[0]);
+
+ sscanf(buf->flash_image_start, "%u", &rootfsaddr);
+ sscanf(buf->kernel_address, "%u", &kerneladdr);
+ sscanf(buf->kernel_length, "%u", &kernellen);
+ sscanf(buf->total_length, "%u", &totallen);
+
+ pr_info("CFE boot tag found with version %s and board type %s\n",
+ tagversion, boardid);
+
+ kerneladdr = kerneladdr - BCM63XX_EXTENDED_SIZE;
+ rootfsaddr = rootfsaddr - BCM63XX_EXTENDED_SIZE;
+ spareaddr = roundup(totallen, master->erasesize) + cfelen;
+
+ if (rootfsaddr < kerneladdr) {
+ /* default Broadcom layout */
+ rootfslen = kerneladdr - rootfsaddr;
+ rootfs_first = true;
+ } else {
+ /* OpenWrt layout */
+ rootfsaddr = kerneladdr + kernellen;
+ rootfslen = spareaddr - rootfsaddr;
+ }
+ } else {
+ pr_warn("CFE boot tag CRC invalid (expected %08x, actual %08x)\n",
+ buf->header_crc, computed_crc);
+ kernellen = 0;
+ rootfslen = 0;
+ rootfsaddr = 0;
+ spareaddr = cfelen;
+ }
+ sparelen = master->size - spareaddr - nvramlen;
+
+ /* Determine number of partitions */
+ if (rootfslen > 0)
+ nrparts++;
+
+ if (kernellen > 0)
+ nrparts++;
+
+ /* Ask kernel for more memory */
+ parts = kzalloc(sizeof(*parts) * nrparts + 10 * nrparts, GFP_KERNEL);
+ if (!parts) {
+ vfree(buf);
+ return -ENOMEM;
+ }
+
+ /* Start building partition list */
+ parts[curpart].name = "CFE";
+ parts[curpart].offset = 0;
+ parts[curpart].size = cfelen;
+ curpart++;
+
+ if (kernellen > 0) {
+ int kernelpart = curpart;
+
+ if (rootfslen > 0 && rootfs_first)
+ kernelpart++;
+ parts[kernelpart].name = "kernel";
+ parts[kernelpart].offset = kerneladdr;
+ parts[kernelpart].size = kernellen;
+ curpart++;
+ }
+
+ if (rootfslen > 0) {
+ int rootfspart = curpart;
+
+ if (kernellen > 0 && rootfs_first)
+ rootfspart--;
+ parts[rootfspart].name = "rootfs";
+ parts[rootfspart].offset = rootfsaddr;
+ parts[rootfspart].size = rootfslen;
+ if (sparelen > 0 && !rootfs_first)
+ parts[rootfspart].size += sparelen;
+ curpart++;
+ }
+
+ parts[curpart].name = "nvram";
+ parts[curpart].offset = master->size - nvramlen;
+ parts[curpart].size = nvramlen;
+ curpart++;
+
+ /* Global partition "linux" to make easy firmware upgrade */
+ parts[curpart].name = "linux";
+ parts[curpart].offset = cfelen;
+ parts[curpart].size = master->size - cfelen - nvramlen;
+
+ for (i = 0; i < nrparts; i++)
+ pr_info("Partition %d is %s offset %llx and length %llx\n", i,
+ parts[i].name, parts[i].offset, parts[i].size);
+
+ pr_info("Spare partition is offset %x and length %x\n", spareaddr,
+ sparelen);
+
+ *pparts = parts;
+ vfree(buf);
+
+ return nrparts;
+};
+
+static struct mtd_part_parser bcm63xx_cfe_parser = {
+ .owner = THIS_MODULE,
+ .parse_fn = bcm63xx_parse_cfe_partitions,
+ .name = "bcm63xxpart",
+};
+
+static int __init bcm63xx_cfe_parser_init(void)
+{
+ register_mtd_parser(&bcm63xx_cfe_parser);
+ return 0;
+}
+
+static void __exit bcm63xx_cfe_parser_exit(void)
+{
+ deregister_mtd_parser(&bcm63xx_cfe_parser);
+}
+
+module_init(bcm63xx_cfe_parser_init);
+module_exit(bcm63xx_cfe_parser_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Daniel Dickinson <openwrt@cshore.neomailbox.net>");
+MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
+MODULE_AUTHOR("Mike Albon <malbon@openwrt.org>");
+MODULE_AUTHOR("Jonas Gorski <jonas.gorski@gmail.com");
+MODULE_DESCRIPTION("MTD partitioning for BCM63XX CFE bootloaders");
Code Review / kvmfornfv.git / blobdiff